Scripting RPG class GUI?

hi if im a new scripter on roblox and I want to script a GUI to make a class GUI where when you click a class you keep that class forever even when you leave then it tps you to the main map and you still keep that class and you can only buy weapons for that class. this is obviously wrong please fix this a = Instance.new("Screengui") a.Parent = game.Startergui b = Instance.new("TextLabel") b.Parent = game.Startergui.Screengui b.Text = ("Healer")